Find an equation in spherical coordinates for the equation given in rectangular coordinates. 
Definitions:
Sales Discounts
Reductions in the price of goods or services that are offered by sellers to incentivize prompt payment by buyers.
Net Sales
The revenue a company earns from its sales activities, minus the costs associated with returns, compensation for faulty or missing items, and permitted discounts.
Normal Credit Balance
The usual balance side of an account, considered a credit for liability, revenue, and equity accounts.
Sales Discounts
A reduction from the gross or total price of goods or services offered by the seller to the buyer under certain conditions.
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